Drinking Water Laboratory Certification and Data Reporting


Chapter 246-390 WAC, makes sure labs that test drinking water meet certain standards. It sets rules for labs that analyze drinking water samples. The rule aims to ensure safe drinking water and to protect public health.

For More Information

Statutory Authority: RCW 43.20.050
State Board of Health Contact: Shay Bauman, shay.bauman@sboh.wa.gov
Department of Health Contacts: Kseniya Efremova, kseniya.efremova@doh.wa.gov, and Mike Means, mike.means@doh.wa.gov

Additional Background

On October 13, 2021, the Board adopted amendments to chapter 246-390 WAC. In concurrent action, the Board adopted amendments to chapter 246-290 WAC, Group A Public Water Supplies. Among other features, the amended rules establish:

  • drinking water standards for five per- and polyfluoroalkyl substances (PFAS) as State Action Levels (SALs);
  • requirements for monitoring, recordkeeping, reporting, and other follow-up actions;
  • criteria and procedures for adopting SALs and state Maximum Contaminant Levels (MCL); and
  • laboratory analytical and reporting requirements that align the two rules.

The revised rules took effect January 1, 2022.

CR-101 filed on February 11, 2020 as WSR 20-05-032
CR-102 filed on August 3, 2021 as WSR 21-16-094
Cr-103 filed on November 17, 2021 as WSR 21-23-096

Related Links: Meeting Materials